x86, io_apic: Convert setup_ioapic_entry to function pointer

This pointer is changed to a different function when IRQ
remapping is enabled.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
5 files changed